Hi,
Is there any way to retrieve the value of OP from OPc and Ki?
Best, Kathryn
HI Kathryn,
As far as I remember there is no way. I remember looking into the way OPc is generated, and it is non-reversible.
Cheers, Domi
- szept. 27. dátummal, 23:37 időpontban Kathryn Heckman exuberant.kathryn.heckman@gmail.com írta:
Hi,
Is there any way to retrieve the value of OP from OPc and Ki?
Best, Kathryn
Hi Kathryn,
On Wed, Sep 27, 2017 at 05:37:36PM -0400, Kathryn Heckman wrote:
Is there any way to retrieve the value of OP from OPc and Ki?
No, that defeats the entire purpose of having card-individual OPc values.
If you could just revert that operation, there would be no [security] advantage of card-individual OPc values over a global OP value, and hence that entire option could be dropped from the specifications altogether.
Regards, Harald
I really appreciate your quick replies.
I have a USIM that I wanted to program. However, I am getting the runtime error for exceeding the number of attempts to enter the ADM1 key. Is there any fix for it?
-- Kathryn
On Wed, Sep 27, 2017 at 6:52 PM, Harald Welte laforge@gnumonks.org wrote:
Hi Kathryn,
On Wed, Sep 27, 2017 at 05:37:36PM -0400, Kathryn Heckman wrote:
Is there any way to retrieve the value of OP from OPc and Ki?
No, that defeats the entire purpose of having card-individual OPc values.
If you could just revert that operation, there would be no [security] advantage of card-individual OPc values over a global OP value, and hence that entire option could be dropped from the specifications altogether.
Regards, Harald --
- Harald Welte laforge@gnumonks.org
http://laforge.gnumonks.org/
================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)
On 9/27/17, Kathryn Heckman exuberant.kathryn.heckman@gmail.com wrote:
I have a USIM that I wanted to program. However, I am getting the runtime error for exceeding the number of attempts to enter the ADM1 key. Is there any fix for it?
Someone please correct me if I am wrong, but I would assume that having exceeded the number of attempts to enter the ADM1 key means that the USIM is bricked beyond recovery.
But the sysmoUSIM cards sold at shop.sysmocom.de are fairly inexpensive for a pack of 10, so a bricked (U)SIM shouldn't be too big of a tragedy - or is there another dimension to this problem which I am missing?
If you are anywhere near local to me (California, USA) I could give you one of my sysmoUSIM cards, but I am guessing it probably won't help you as I bought the cheaper version without the ADM1 keys - for my application (production testing of my GSM MS hardware) it doesn't matter what the programming of the (U)SIM happens to be.
M~
Hi Kathryn and Mychaela,
2017. szept. 28. dátummal, 4:04 időpontban Mychaela Falconia mychaela.falconia@gmail.com írta:
Someone please correct me if I am wrong, but I would assume that having exceeded the number of attempts to enter the ADM1 key means that the USIM is bricked beyond recovery.
This is my understanding as well.
Cheers,
Domi
-
Harald Welte -
Kathryn Heckman -
Mychaela Falconia -
Tomcsányi Domonkos -
Tomcsányi, Domonkos